feat(upgrade): upgrade to Angular 9

BREAKING CHANGE: upgrade to Angular 9

Author: nivekcode

.gitignore

@@ -1,5 +1,8 @@
 # See http://help.github.com/ignore-files/ for more about ignoring files.
 
+# library readme - will be copied during build
+projects/ng-sortgrid/README.md
+
 # compiled output
 /dist
 /tmp

README.md

@@ -1,6 +1,6 @@
 [![Travis build badge](https://img.shields.io/travis/kreuzerk/ng-sortgrid.svg)](https://travis-ci.org/kreuzerk/ng-sortgrid)
 [![codecov](https://codecov.io/gh/kreuzerk/ng-sortgrid/branch/master/graph/badge.svg)](https://codecov.io/gh/kreuzerk/ng-sortgrid)
-[![angular7](https://img.shields.io/badge/angular%207%20ready-true-green.svg)]()
+[![angular9](https://img.shields.io/badge/angular%209%20ready-true-green.svg)]()
 
 # Ng-sortgrid